раскройте скобки и приведите подобные слагаемые
1) (m+3) - (6m + 5) - (m-1)
2) (x-y) + (x-y) - (2x+y)
3) (0.2x-3) - (x-2) - (0.4x-1)
1) (m+3) - (6m + 5) - (m-1)
2) (x-y) + (x-y) - (2x+y)
3) (0.2x-3) - (x-2) - (0.4x-1)
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Answers & Comments
2)=x-y+x-y-2x-y=-x-3y
3)=0,2x-3-x+2-0,4x+1=-1,2x